bbbb bbbs bibb bibi bibo bibs biis bio- bioi bios bipp bips bis- biso bisp biss bobb bobi bobo bobs boi- boii bois boob boop boos bopp bops bosi boso boss bsos bspp ibis ibos ibss iiii iiio iiis iioi iioo iiop iios iisi iisp iobi ioii ioio iooi iooo ioos iops ioso ipop ipos ippo ipsi ipso ipsp ipss isis iso- isop isos isps issi isso issp isss obbo obis oboi obos obss oiii oios oobi oooo ooos oops oosi opii opio opis opo- opos oppi oppo opps opsi osbp osii osip osis osoi osoo osos ossb ossi osso pbsp pibb pibi piip piob pipi pipo pipp pips pisi piso piss pobo pobs poio pois poop poos pop- popi popo popp pops posb posi poso poss ppib ppos pppo pppp ppps ppss psip psis psoi psos pspi pspp psps psso s-ib s-ii s-os sbbs sbsi sbsp sibi sibo sibs siop sios sipi sipo sipp sips sisi siss sobo sobp sobs sois soop soos sopi sopo sopp sops sosi soso soss spib spio spip spis spoo spop spos spps spso spsp spss ssis ssop sspo ssps sssb sssi ssss